Magnetotransport Properties of a Nodal Line Semimetal TiSi
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摘要:
We report the magnetoresistance (MR),de Haas-van Alphen (dHvA) effect and Hall effect measurements on a single crystal of TiSi,which is predicted to be a nodal line semimetal.With application of a magnetic field,a metal-to-insulator-like transition in p(T) and a nonsaturating MR are observed at low temperatures.The dHvA oscillations reveal a small Fermi-surface pocket with a nontrivial Berry phase.The analysis of the nonlinear Hall resistivity shows that TiSi is a multiband system with low carrier densities and high mobilities.All these results unambiguously prove the existence of Dirac fermions in TiSi.